[PATCH v4 2/3] mtd: mtk-nor: mtk serial flash controller driver

Bayi Cheng
2015-10-13T09:39:19Z

add spi nor flash driver for mediatek controller

Signed-off-by: Bayi Cheng <bayi.cheng@mediatek.com>
---
drivers/mtd/spi-nor/Kconfig | 7 +
drivers/mtd/spi-nor/Makefile | 1 +
drivers/mtd/spi-nor/mtk-quadspi.c | 486 ++++++++++++++++++++++++++++++++++++++
3 files changed, 494 insertions(+)
create mode 100644 drivers/mtd/spi-nor/mtk-quadspi.c

diff --git a/drivers/mtd/spi-nor/Kconfig b/drivers/mtd/spi-nor/Kconfig
index 89bf4c1..f433890 100644
--- a/drivers/mtd/spi-nor/Kconfig
+++ b/drivers/mtd/spi-nor/Kconfig
@@ -7,6 +7,13 @@ menuconfig MTD_SPI_NOR

if MTD_SPI_NOR

+config MTD_MT81xx_NOR
+ tristate "Support SPI flash Controller MTD_MT81xx_NOR"
+ help
+ This enables access to SPI Nor flash, using MTD_MT81XX_NOR controller.
+ This controller does nor support generic SPI BUS, It only supports
+ SPI NOR Flash.
+
config MTD_SPI_NOR_USE_4K_SECTORS
bool "Use small 4096 B erase sectors"
default y
diff --git a/drivers/mtd/spi-nor/Makefile b/drivers/mtd/spi-nor/Makefile
index e53333e..37c020a 100644
--- a/drivers/mtd/spi-nor/Makefile
+++ b/drivers/mtd/spi-nor/Makefile
@@ -1,3 +1,4 @@
+obj-$(CONFIG_MTD_MT81xx_NOR) += mtk-quadspi.o
obj-$(CONFIG_MTD_SPI_NOR) += spi-nor.o
obj-$(CONFIG_SPI_FSL_QUADSPI) += fsl-quadspi.o
obj-$(CONFIG_SPI_NXP_SPIFI) += nxp-spifi.o
diff --git a/drivers/mtd/spi-nor/mtk-quadspi.c b/drivers/mtd/spi-nor/mtk-quadspi.c
new file mode 100644
index 0000000..c6ac366
--- /dev/null
+++ b/drivers/mtd/spi-nor/mtk-quadspi.c
@@ -0,0 +1,486 @@
+/*
+ * Copyright (c) 2015 MediaTek Inc.
+ * Author: Bayi Cheng <bayi.cheng@mediatek.com>
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License version 2 as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <linux/clk.h>
+#include <linux/delay.h>
+#include <linux/device.h>
+#include <linux/init.h>
+#include <linux/io.h>
+#include <linux/iopoll.h>
+#include <linux/ioport.h>
+#include <linux/math64.h>
+#include <linux/module.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mutex.h>
+#include <linux/of.h>
+#include <linux/of_device.h>
+#include <linux/of_gpio.h>
+#include <linux/pinctrl/consumer.h>
+#include <linux/platform_device.h>
+#include <linux/slab.h>
+#include <linux/mtd/mtd.h>
+#include <linux/mtd/partitions.h>
+#include <linux/mtd/spi-nor.h>
+
+#define MTK_NOR_CMD_REG 0x00
+#define MTK_NOR_CNT_REG 0x04
+#define MTK_NOR_RDSR_REG 0x08
+#define MTK_NOR_RDATA_REG 0x0c
+#define MTK_NOR_RADR0_REG 0x10
+#define MTK_NOR_RADR1_REG 0x14
+#define MTK_NOR_RADR2_REG 0x18
+#define MTK_NOR_WDATA_REG 0x1c
+#define MTK_NOR_PRGDATA0_REG 0x20
+#define MTK_NOR_PRGDATA1_REG 0x24
+#define MTK_NOR_PRGDATA2_REG 0x28
+#define MTK_NOR_PRGDATA3_REG 0x2c
+#define MTK_NOR_PRGDATA4_REG 0x30
+#define MTK_NOR_PRGDATA5_REG 0x34
+#define MTK_NOR_SHREG0_REG 0x38
+#define MTK_NOR_SHREG1_REG 0x3c
+#define MTK_NOR_SHREG2_REG 0x40
+#define MTK_NOR_SHREG3_REG 0x44
+#define MTK_NOR_SHREG4_REG 0x48
+#define MTK_NOR_SHREG5_REG 0x4c
+#define MTK_NOR_SHREG6_REG 0x50
+#define MTK_NOR_SHREG7_REG 0x54
+#define MTK_NOR_SHREG8_REG 0x58
+#define MTK_NOR_SHREG9_REG 0x5c
+#define MTK_NOR_CFG1_REG 0x60
+#define MTK_NOR_CFG2_REG 0x64
+#define MTK_NOR_CFG3_REG 0x68
+#define MTK_NOR_STATUS0_REG 0x70
+#define MTK_NOR_STATUS1_REG 0x74
+#define MTK_NOR_STATUS2_REG 0x78
+#define MTK_NOR_STATUS3_REG 0x7c
+#define MTK_NOR_FLHCFG_REG 0x84
+#define MTK_NOR_TIME_REG 0x94
+#define MTK_NOR_PP_DATA_REG 0x98
+#define MTK_NOR_PREBUF_STUS_REG 0x9c
+#define MTK_NOR_DELSEL0_REG 0xa0
+#define MTK_NOR_DELSEL1_REG 0xa4
+#define MTK_NOR_INTRSTUS_REG 0xa8
+#define MTK_NOR_INTREN_REG 0xac
+#define MTK_NOR_CHKSUM_CTL_REG 0xb8
+#define MTK_NOR_CHKSUM_REG 0xbc
+#define MTK_NOR_CMD2_REG 0xc0
+#define MTK_NOR_WRPROT_REG 0xc4
+#define MTK_NOR_RADR3_REG 0xc8
+#define MTK_NOR_DUAL_REG 0xcc
+#define MTK_NOR_DELSEL2_REG 0xd0
+#define MTK_NOR_DELSEL3_REG 0xd4
+#define MTK_NOR_DELSEL4_REG 0xd8
+
+/* commands for mtk nor controller */
+#define MTK_NOR_READ_CMD 0x0
+#define MTK_NOR_RDSR_CMD 0x2
+#define MTK_NOR_PRG_CMD 0x4
+#define MTK_NOR_WR_CMD 0x10
+#define MTK_NOR_PIO_WR_CMD 0x90
+#define MTK_NOR_WRSR_CMD 0x20
+#define MTK_NOR_PIO_READ_CMD 0x81
+#define MTK_NOR_WR_BUF_ENABLE 0x1
+#define MTK_NOR_WR_BUF_DISABLE 0x0
+#define MTK_NOR_ENABLE_SF_CMD 0x30
+#define MTK_NOR_DUAD_ADDR_EN 0x8
+#define MTK_NOR_QUAD_READ_EN 0x4
+#define MTK_NOR_DUAL_ADDR_EN 0x2
+#define MTK_NOR_DUAL_READ_EN 0x1
+#define MTK_NOR_DUAL_DISABLE 0x0
+#define MTK_NOR_FAST_READ 0x1
+
+#define SFLASH_WRBUF_SIZE 128
+
+struct mt8173_nor {
+ struct mtd_info mtd;
+ struct spi_nor nor;
+ struct device *dev;
+ void __iomem *base; /* nor flash base address */
+ struct clk *spi_clk;
+ struct clk *nor_clk;
+};
+
+static void mt8173_nor_set_read_mode(struct mt8173_nor *mt8173_nor)
+{
+ struct spi_nor *nor = &mt8173_nor->nor;
+
+ switch (nor->flash_read) {
+ case SPI_NOR_FAST:
+ writeb(SPINOR_OP_READ_FAST, mt8173_nor->base +
+ MTK_NOR_PRGDATA3_REG);
+ writeb(MTK_NOR_FAST_READ, mt8173_nor->base +
+ MTK_NOR_CFG1_REG);
+ break;
+ case SPI_NOR_DUAL:
+ writeb(SPINOR_OP_READ_1_1_2, mt8173_nor->base +
+ MTK_NOR_PRGDATA3_REG);
+ writeb(MTK_NOR_DUAL_READ_EN, mt8173_nor->base +
+ MTK_NOR_DUAL_REG);
+ break;
+ case SPI_NOR_QUAD:
+ writeb(SPINOR_OP_READ_1_1_4, mt8173_nor->base +
+ MTK_NOR_PRGDATA3_REG);
+ writeb(MTK_NOR_QUAD_READ_EN, mt8173_nor->base +
+ MTK_NOR_DUAL_REG);
+ break;
+ default:
+ writeb(SPINOR_OP_READ, mt8173_nor->base +
+ MTK_NOR_PRGDATA3_REG);
+ writeb(MTK_NOR_DUAL_DISABLE, mt8173_nor->base +
+ MTK_NOR_DUAL_REG);
+ break;
+ }
+}
+
+static int mt8173_nor_execute_cmd(struct mt8173_nor *mt8173_nor, u8 cmdval)
+{
+ int reg;
+ u8 val = cmdval & 0x1f;
+
+ writeb(cmdval, mt8173_nor->base + MTK_NOR_CMD_REG);
+ return readl_poll_timeout(mt8173_nor->base + MTK_NOR_CMD_REG, reg,
+ !(reg & val), 100, 10000);
+}
+
+static int mt8173_nor_set_cmd(struct mt8173_nor *mt8173_nor, int addr, u8 len,
+ u8 op)
+{
+ writeb(op, mt8173_nor->base + MTK_NOR_PRGDATA5_REG);
+ /* send the address to nor flash
+ * MTK_NOR_PRGDATA5_REG is shifted first
+ */
+ if (len > 8) {
+ writeb((addr >> 16), mt8173_nor->base + MTK_NOR_PRGDATA4_REG);
+ writeb((addr >> 8), mt8173_nor->base + MTK_NOR_PRGDATA3_REG);
+ writeb((addr), mt8173_nor->base + MTK_NOR_PRGDATA2_REG);
+ }
+ writeb(len, mt8173_nor->base + MTK_NOR_CNT_REG);
+ return mt8173_nor_execute_cmd(mt8173_nor, MTK_NOR_PRG_CMD);
+}
+
+/* cmd1 sent to nor flash, cmd2 write to nor controller */
+static int mt8173_nor_set_para(struct mt8173_nor *mt8173_nor, int cmd1,
+ int cmd2)
+{
+ int ret;
+
+ ret = mt8173_nor_set_cmd(mt8173_nor, 0, 8, SPINOR_OP_WREN);
+ if (ret < 0)
+ return ret;
+
+ writeb(cmd1, mt8173_nor->base + MTK_NOR_PRGDATA5_REG);
+ writeb(8, mt8173_nor->base + MTK_NOR_CNT_REG);
+ return mt8173_nor_execute_cmd(mt8173_nor, cmd2);
+}
+
+static int mt8173_nor_write_buffer_enable(struct mt8173_nor *mt8173_nor)
+{
+ u8 reg;
+
+ /* the bit0 of MTK_NOR_CFG2_REG is pre-fetch buffer
+ * 0: pre-fetch buffer use for read
+ * 1: pre-fetch buffer use for page program
+ */
+ writel(MTK_NOR_WR_BUF_ENABLE, mt8173_nor->base + MTK_NOR_CFG2_REG);
+ return readb_poll_timeout(mt8173_nor->base + MTK_NOR_CFG2_REG, reg,
+ 0x01 == (reg & 0x01), 100, 10000);
+}
+
+static int mt8173_nor_write_buffer_disable(struct mt8173_nor *mt8173_nor)
+{
+ u8 reg;
+
+ writel(MTK_NOR_WR_BUF_DISABLE, mt8173_nor->base + MTK_NOR_CFG2_REG);
+ return readb_poll_timeout(mt8173_nor->base + MTK_NOR_CFG2_REG, reg,
+ MTK_NOR_WR_BUF_DISABLE == (reg & 0x1), 100,
+ 10000);
+}
+
+static int mt8173_nor_erase_sector(struct spi_nor *nor, loff_t offset)
+{
+ int ret;
+ struct mt8173_nor *mt8173_nor = nor->priv;
+
+ ret = mt8173_nor_set_cmd(mt8173_nor, 0, 8, SPINOR_OP_WREN);
+ if (ret < 0)
+ return ret;
+
+ return mt8173_nor_set_cmd(mt8173_nor, (int)offset, 32, SPINOR_OP_BE_4K);
+}
+
+static int mt8173_nor_read(struct spi_nor *nor, loff_t from, size_t length,
+ size_t *retlen, u_char *buffer)
+{
+ int i, ret;
+ int addr = (int)from;
+ u8 *buf = (u8 *)buffer;
+ struct mt8173_nor *mt8173_nor = nor->priv;
+
+ /* set mode for fast read mode ,dual mode or quad mode */
+ mt8173_nor_set_read_mode(mt8173_nor);
+ writeb((addr >> 24), mt8173_nor->base + MTK_NOR_RADR3_REG);
+ writeb((addr >> 16), mt8173_nor->base + MTK_NOR_RADR2_REG);
+ writeb((addr >> 8), mt8173_nor->base + MTK_NOR_RADR1_REG);
+ writeb(addr, mt8173_nor->base + MTK_NOR_RADR0_REG);
+
+ for (i = 0; i < length; i++, (*retlen)++) {
+ ret = mt8173_nor_execute_cmd(mt8173_nor, MTK_NOR_PIO_READ_CMD);
+ if (ret < 0)
+ return ret;
+ buf[i] = readb(mt8173_nor->base + MTK_NOR_RDATA_REG);
+ }
+ return 0;
+}
+
+static int mt8173_nor_write_single_byte(struct mt8173_nor *mt8173_nor,
+ int addr, int length, u8 *data)
+{
+ int i, ret;
+
+ writeb((addr >> 24), mt8173_nor->base + MTK_NOR_RADR3_REG);
+ writeb((addr >> 16), mt8173_nor->base + MTK_NOR_RADR2_REG);
+ writeb((addr >> 8), mt8173_nor->base + MTK_NOR_RADR1_REG);
+ writeb(addr, mt8173_nor->base + MTK_NOR_RADR0_REG);
+
+ for (i = 0; i < length; i++) {
+ ret = mt8173_nor_execute_cmd(mt8173_nor, MTK_NOR_PIO_WR_CMD);
+ if (ret < 0)
+ return ret;
+ writeb(*data++, mt8173_nor->base + MTK_NOR_WDATA_REG);
+ }
+ return 0;
+}
+
+static int mt8173_nor_write_buffer(struct mt8173_nor *mt8173_nor, int addr,
+ const u8 *buf)
+{
+ int i, bufidx, data;
+
+ writeb((addr >> 24), mt8173_nor->base + MTK_NOR_RADR3_REG);
+ writeb((addr >> 16), mt8173_nor->base + MTK_NOR_RADR2_REG);
+ writeb((addr >> 8), mt8173_nor->base + MTK_NOR_RADR1_REG);
+ writeb(addr, mt8173_nor->base + MTK_NOR_RADR0_REG);
+
+ bufidx = 0;
+ for (i = 0; i < SFLASH_WRBUF_SIZE; i += 4) {
+ data = buf[bufidx + 3]<<24 | buf[bufidx + 2]<<16 |
+ buf[bufidx + 1]<<8 | buf[bufidx];
+ bufidx += 4;
+ writel(data, mt8173_nor->base + MTK_NOR_PP_DATA_REG);
+ }
+ return mt8173_nor_execute_cmd(mt8173_nor, MTK_NOR_WR_CMD);
+}
+
+static void mt8173_nor_write(struct spi_nor *nor, loff_t to, size_t len,
+ size_t *retlen, const u_char *buf)
+{
+ int ret;
+ struct mt8173_nor *mt8173_nor = nor->priv;
+
+ ret = mt8173_nor_write_buffer_enable(mt8173_nor);
+ if (ret < 0)
+ dev_warn(mt8173_nor->dev, "write buffer enable failed!\n");
+
+ while (len >= SFLASH_WRBUF_SIZE) {
+ ret = mt8173_nor_write_buffer(mt8173_nor, to, buf);
+ if (ret < 0)
+ dev_warn(mt8173_nor->dev, "write buffer failed!\n");
+ len -= SFLASH_WRBUF_SIZE;
+ to += SFLASH_WRBUF_SIZE;
+ buf += SFLASH_WRBUF_SIZE;
+ (*retlen) += SFLASH_WRBUF_SIZE;
+ }
+ ret = mt8173_nor_write_buffer_disable(mt8173_nor);
+ if (ret < 0)
+ dev_warn(mt8173_nor->dev, "write buffer disable failed!\n");
+
+ if (len) {
+ ret = mt8173_nor_write_single_byte(mt8173_nor, to, (int)len,
+ (u8 *)buf);
+ if (ret < 0)
+ dev_warn(mt8173_nor->dev, "write single byte failed!\n");
+ (*retlen) += len;
+ }
+}
+
+static int mt8173_nor_read_reg(struct spi_nor *nor, u8 opcode, u8 *buf, int len)
+{
+ int ret;
+ struct mt8173_nor *mt8173_nor = nor->priv;
+
+ /* mtk nor controller doesn't supoort SPINOR_OP_RDCR */
+ switch (opcode) {
+ case SPINOR_OP_RDID:
+ /* read JEDEC ID need 4 bytes commands */
+ ret = mt8173_nor_set_cmd(mt8173_nor, 0, 32, SPINOR_OP_RDID);
+ if (ret < 0)
+ return ret;
+
+ /* mtk nor flash controller only support 3 bytes IDs */
+ buf[2] = readb(mt8173_nor->base + MTK_NOR_SHREG0_REG);
+ buf[1] = readb(mt8173_nor->base + MTK_NOR_SHREG1_REG);
+ buf[0] = readb(mt8173_nor->base + MTK_NOR_SHREG2_REG);
+ break;
+ case SPINOR_OP_RDSR:
+ ret = mt8173_nor_execute_cmd(mt8173_nor, MTK_NOR_RDSR_CMD);
+ if (ret < 0)
+ return ret;
+ *buf = readb(mt8173_nor->base + MTK_NOR_RDSR_REG);
+ break;
+ default:
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+static int mt8173_nor_write_reg(struct spi_nor *nor, u8 opcode, u8 *buf,
+ int len)
+{
+ int ret;
+ struct mt8173_nor *mt8173_nor = nor->priv;
+
+ switch (opcode) {
+ case SPINOR_OP_WRSR:
+ ret = mt8173_nor_set_para(mt8173_nor, *buf,
+ MTK_NOR_WRSR_CMD);
+ break;
+ case SPINOR_OP_CHIP_ERASE:
+ ret = mt8173_nor_set_para(mt8173_nor, opcode,
+ MTK_NOR_PRG_CMD);
+ break;
+ case SPINOR_OP_WREN:
+ ret = mt8173_nor_set_cmd(mt8173_nor, 0, 8, opcode);
+ if (ret)
+ dev_warn(mt8173_nor->dev, "set write enable fail!\n");
+ break;
+ case SPINOR_OP_WRDI:
+ ret = mt8173_nor_set_cmd(mt8173_nor, 0, 8, opcode);
+ if (ret)
+ dev_warn(mt8173_nor->dev, "set write disable fail!\n");
+ break;
+ default:
+ dev_warn(mt8173_nor->dev, "doesn't support cmd %d\n", opcode);
+ ret = -EINVAL;
+ break;
+ }
+ return ret;
+}
+
+static int __init mtk_nor_init(struct mt8173_nor *mt8173_nor,
+ struct mtd_part_parser_data *ppdata)
+{
+ int ret;
+ struct spi_nor *nor;
+ struct mtd_info *mtd;
+
+ writel(MTK_NOR_ENABLE_SF_CMD, mt8173_nor->base + MTK_NOR_WRPROT_REG);
+ nor = &mt8173_nor->nor;
+ mtd = &mt8173_nor->mtd;
+ nor->mtd = *mtd;
+ nor->dev = mt8173_nor->dev;
+ nor->priv = mt8173_nor;
+ mtd->priv = nor;
+
+ /* fill the hooks to spi nor */
+ nor->read = mt8173_nor_read;
+ nor->read_reg = mt8173_nor_read_reg;
+ nor->write = mt8173_nor_write;
+ nor->write_reg = mt8173_nor_write_reg;
+ nor->erase = mt8173_nor_erase_sector;
+ nor->mtd.owner = THIS_MODULE;
+ nor->mtd.name = "mtk_nor";
+ /* initialized with NULL */
+ ret = spi_nor_scan(nor, NULL, SPI_NOR_DUAL);
+ if (ret)
+ return ret;
+
+ dev_dbg(mt8173_nor->dev, "mtd->size :0x%llx!\n", mtd->size);
+ return mtd_device_parse_register(&nor->mtd, NULL, ppdata, NULL, 0);
+}
+
+static int mtk_nor_drv_probe(struct platform_device *pdev)
+{
+ struct device_node *np = pdev->dev.of_node;
+ struct mtd_part_parser_data ppdata;
+ struct resource *res;
+ int ret;
+ struct mt8173_nor *mt8173_nor;
+
+ if (!pdev->dev.of_node) {
+ dev_err(&pdev->dev, "No DT found\n");
+ return -EINVAL;
+ }
+
+ mt8173_nor = devm_kzalloc(&pdev->dev, sizeof(*mt8173_nor), GFP_KERNEL);
+ if (!mt8173_nor)
+ return -ENOMEM;
+ platform_set_drvdata(pdev, mt8173_nor);
+
+ res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
+ mt8173_nor->base = devm_ioremap_resource(&pdev->dev, res);
+ if (IS_ERR(mt8173_nor->base))
+ return PTR_ERR(mt8173_nor->base);
+
+ mt8173_nor->spi_clk = devm_clk_get(&pdev->dev, "spi");
+ if (IS_ERR(mt8173_nor->spi_clk)) {
+ ret = PTR_ERR(mt8173_nor->spi_clk);
+ goto nor_free;
+ }
+
+ mt8173_nor->nor_clk = devm_clk_get(&pdev->dev, "sf");
+ if (IS_ERR(mt8173_nor->nor_clk)) {
+ ret = PTR_ERR(mt8173_nor->nor_clk);
+ goto nor_free;
+ }
+
+ mt8173_nor->dev = &pdev->dev;
+ clk_prepare_enable(mt8173_nor->spi_clk);
+ clk_prepare_enable(mt8173_nor->nor_clk);
+
+ ppdata.of_node = np;
+ ret = mtk_nor_init(mt8173_nor, &ppdata);
+
+nor_free:
+ return ret;
+}
+
+static int mtk_nor_drv_remove(struct platform_device *pdev)
+{
+ struct mt8173_nor *mt8173_nor = platform_get_drvdata(pdev);
+
+ mtd_device_unregister(&mt8173_nor->mtd);
+ clk_disable_unprepare(mt8173_nor->spi_clk);
+ clk_disable_unprepare(mt8173_nor->nor_clk);
+ return 0;
+}
+
+static const struct of_device_id mtk_nor_of_ids[] = {
+ { .compatible = "mediatek,mt8173-nor"},
+ { /* sentinel */ }
+};
+MODULE_DEVICE_TABLE(of, mtk_nor_of_ids);
+
+static struct platform_driver mtk_nor_driver = {
+ .probe = mtk_nor_drv_probe,
+ .remove = mtk_nor_drv_remove,
+ .driver = {
+ .name = "mtk-nor",
+ .of_match_table = mtk_nor_of_ids,
+ },
+};
+
+module_platform_driver(mtk_nor_driver);
+MODULE_LICENSE("GPL v2");
+MODULE_DESCRIPTION("MediaTek SPI NOR Flash Driver");
--
1.8.1.1.dirty